冀中坳陷文安斜坡第三系油气有效输导体系研究

Effective petroleum migration system in the Tertiary of Wen'an Slope,Jizhong Depression

通过断层和砂体特征、古鼻状构造、断层活动史及有效运移通道指数等分析,对冀中坳陷文安斜坡第三系油气输导体系的组成与有效性及其对油气运移的影响进行了研究。研究区输导体系主要由骨架砂岩与多级顺向和反向断层组成,倾伏于斜坡西侧生油洼槽的多个古鼻状构造与该区输导体系的良好配置构成了油气向斜坡汇集与运移的有利条件;油气大规模运移时斜坡上主要断层的垂向输导作用有限,而众多NE向断层侧向调节所导致的砂砂对接使得油气可穿层运移,油气主要以由深层至浅层的阶梯状长距离侧向运移为主。

Based on the analysis of the characteristics of faults and sand bodies,paleo-nose structures,fault activity and effective migration pathway index,the constitution and effectiveness of the migration system in the Tertiary of the Wen＇an Slope of the Jizhong Depression and its effect on oil migration were studied. The migration system of the study area was mainly comprised of framework sandstones and many normal or reverse faults.Several paleo-nose structures towards oil sourcing sags located in the west of the Wen＇an Slope and their match with the migration pathway system was favorable for oil convergence and migration towards the slope. Vertical migration was limited during large-scale oil migration,but lateral migration could occur through sand juxtaposition of different formations laterally adjusted by many NE faults. Ladder-like lateral migration over long distance from deep to shallow was the dominant migration pattern.